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📘 Voltage, current, and resistance name different roles

V is across, I is through, R belongs to the component. Ohm's law links all three.

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. Circuit quantitiesDefine voltage, current, and resistance and use V = I × R with schematic symbols.Voltage is across, current is through, resistance belongs to the component; rearrange the same law to solve for any one.
  2. Predict changesPredict how current responds when voltage or resistance changes and relate power to V and I.At fixed R, I tracks V; at fixed V, I is inversely proportional to R; P = IV links energy delivery rate.
  3. Measure and verifyConnect meters correctly, compute R from measurements, and verify Ohm's law at the bench.Voltmeters go across, ammeters in series; compare measured and predicted values within instrument limits.

Questions this course answers

If voltage stays fixed and resistance doubles, what happens to current?

I = V/R makes current inversely proportional to resistance at fixed voltage.

Where should a voltmeter connect to measure a resistor's voltage?

Voltage is a potential difference between two points, so the meter connects across the component.

How should an ammeter be connected in a simple circuit?

The circuit current must pass through an ammeter, so it belongs in series.

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